IMPORTANT INORGANIC TRENDS

 

IMPORTANT INORGANIC TRENDS 

(SHORT NOTES)

Increasings or Decreasing Order

01. Melting point order of ALKALI METALS

Li > Na > K > Rb > Cs

02. Colour of the flame,FLAME COLORATION

OF ALKALI & ALKALINE EARTH METALS:

Li-Red, 

Na-Golden, 

K-Violet, 

Rb-Red, 

Cs-Blue, 

Ca-Brick red, 

Sr-Blood red, 

Ba-Apple green

03. Stability of hydrides =

ALKALI METALS:

LiH > NaH > KH > RbH> CsH

04. Basic nature of hydroxides=

LIOH < NaOH < KOH < RbOH < CsOH

05. )Hydration energy=

Li> Na > K> Rb > Cs

06.) Reducing character=

Li > Cs > Rb > K > Na

07.) Stability of +3 oxidation state in Group 13 or Boron Family:(Due to inert pair effect)

 B> Al > Ga > In > T1

08. Stability of +1 oxidation state  in Group 13 or Boron Family:(Due to inert pair effect)

= B<Al<Ga < In < TI

09. Basic nature of the oxides and hydroxides= 

B< Al< Ga < In < TI

10. Relative strength of Lewis acid= 

BF3 < BCl3 < BBr3 < BI3

11. Ionisation energy=

B> Al  In  SiO2 > Ge02 > SnO2 > PbO2

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15. Reducing nature of hydrides of Group 14 or Carbon Family:

 CH4 < SiH4  < GeH4  < SnH4 < PbH4

16. Thermal stability of tetrahalides of Group 14 or Carbon Family:

CCl4> SiCl4> GeCl4> SnCl4 > PbCl4

17. Oxidising character of M+4 species of Group 14 or Carbon Family:

 GeCl4 < SnCl4 < PbCl4

18. Ease of hydrolysis of tetrahalides of Group 14 or Carbon Family:

 SiCl4 < GeCl4 < SnCl4 < PbCI4

19. Acidic strength of trioxides of Group 15 or Nitrogen family:

 N203 > P2O3 > As2O3

20. Acidic strength of pentoxides of Group 15 or Nitrogen family:

N2O2 > P2O2> As202 > Sb2O2 > Bi̟202

21) Acidic strength of oxides of nitrogen= 

N2O < NO  <N2O3 < N2O4 < N2O5

22) Basic strength of Hydrides of Group 15:

NH3> PH3 > AsH3 > SbH3 > BiH3

23. Stability of trihalides of nitrogen=

 NF3 > NCl3 > NBr3

24.Lewis base strength=

NF3  PCI3 > AsCl3 > SbCl3 > BiCl3

26.Lewis acid strength of trihalides of P, As, and Sb=

PCl3 > ASCl3 > SbCl3

27. Lewis acid strength among phosphorus trihalides

PF3 > PCl3 > PBr3 > PI3

(28) Melting and boiling point of hydrides=

 H2O > H2Te > H2Se >H2S

29. Volatility of hydrides=

H2O < H2Te < H2Se < H2S

30. Reducing nature of hydrides=

H2S < H2Se < H2Te

31. Covalent character of hydrides=

 H2O < H2S < H2Se < H2Te

32. The acidic character of oxides (elements in the same oxidation state)=

SO2 > SeO2 > TeO2 > PoO2

 

33. Acidic character of oxide of a particular element (e.g. S)=

SO < SO2 < SO3

34. Bond energy of halogens=

Cl2 > Br2 > F2 > I2

35. Solubility of halogen in water =

F2 > Cl2 > Br2 > I2

36. Oxidising power=

F2 > Cl2 > Br2 > I2 

37. Enthalpy of hydration of X ion=

F- > Cl- > Br- >I-

38. Reactivity of halogens:=

F> Cl> Br > I

39. Ionic character of M-X bond in halides

= M-F > M-Cl > MBr > M-I

40. Reducing character of X ion:=

I- > Br- > Cl- > F-

41. Acidic strength of halogen acids=

HI > HBr > HCI > HF

42 Reducing property of hydrogen halides

= HF < HCL < HBr < HI

43. Oxidising power of oxides of chlorine

= Cl2O > ClO2 > Cl206 > Cl2O7

44. Decreasing ionic size= 

02- > F- > Na+ > Mg2+

45 Increasing acidic property=

Na2O3 < MgO < ZnO< P205

46 Increasing bond length=

N2 <02 < F2 < CL2

47 Increasing size=

Ca2+ < Cl- < S2-

48) Increasing acid strength=

 HClO < HClO2 < HClO3 < HClO4

49)Acidic character of oxide of a group

 element 

SO2 > TeO2 > SeO2 > PoO2

50) Acidic character of tri oxide of a group 16

 element 

SO3 > SeO3  > TeO3

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